Turkey Porchetta Recipe

Name: Turkey Porchetta Recipe
Ingredients: Kosher salt and freshly ground black pepper, plus 1/2 tablespoon whole black peppercorns; 1/4 cup fresh sage leaves; 4 medium cloves garlic; 1/2 tablespoon whole fennel seeds; 1/2 teaspoon red pepper flakes; 1 whole bone-in, skin-on turkey breast (about 4 to 5 pounds), patted dry; 2 tablespoons canola oil; 1 quart low sodium homemade or store-bought chicken or turkey stock; 1 small carrot, roughly chopped; 1 large stalk celery, roughly chopped; 1 medium onion, roughly choppped; 2 bay leaves; 2 tablespoons unsalted butter; 2 tablespoons flour